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Rework m4a seek/resume code. Seek/resume does now also work properly with files having sample_to_chunk of 1 or 2.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29178 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann
parent
02dce4500d
commit
411023c6be
2 changed files with 74 additions and 86 deletions
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@ -267,57 +267,44 @@ unsigned int alac_seek(demux_res_t* demux_res, stream_t* stream,
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uint32_t sound_sample_loc, uint32_t* sound_samples_done,
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int* current_sample)
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{
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uint32_t i;
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uint32_t j;
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uint32_t new_sample;
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uint32_t new_sound_sample;
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uint32_t new_pos;
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uint32_t i = 0;
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uint32_t tmp_var, tmp_cnt, tmp_dur;
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uint32_t new_sample = 0; /* Holds the amount of chunks/frames. */
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uint32_t new_sound_sample = 0; /* Sums up total amount of samples. */
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uint32_t new_pos; /* Holds the desired chunk/frame index. */
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/* First check we have the appropriate metadata - we should always
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* have it.
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*/
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if ((demux_res->num_time_to_samples==0) ||
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(demux_res->num_sample_byte_sizes==0))
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if (!demux_res->num_time_to_samples || !demux_res->num_sample_byte_sizes)
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{
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return 0;
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}
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/* Find the destination block from time_to_sample array */
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i = 0;
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new_sample = 0;
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new_sound_sample = 0;
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while ((i < demux_res->num_time_to_samples) &&
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(new_sound_sample < sound_sample_loc))
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time_to_sample_t *tab = demux_res->time_to_sample;
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while (i < demux_res->num_time_to_samples)
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{
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j = (sound_sample_loc - new_sound_sample) /
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demux_res->time_to_sample[i].sample_duration;
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if (j <= demux_res->time_to_sample[i].sample_count)
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tmp_cnt = tab[i].sample_count;
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tmp_dur = tab[i].sample_duration;
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tmp_var = tmp_cnt * tmp_dur;
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if (sound_sample_loc <= new_sound_sample + tmp_var)
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{
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new_sample += j;
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new_sound_sample += j *
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demux_res->time_to_sample[i].sample_duration;
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tmp_var = (sound_sample_loc - new_sound_sample);
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new_sample += tmp_var / tmp_dur;
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new_sound_sample += tmp_var;
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break;
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}
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else
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{
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new_sound_sample += (demux_res->time_to_sample[i].sample_duration
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* demux_res->time_to_sample[i].sample_count);
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new_sample += demux_res->time_to_sample[i].sample_count;
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i++;
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}
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new_sample += tmp_cnt;
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new_sound_sample += tmp_var;
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++i;
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}
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/* We know the new block, now calculate the file position. */
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new_pos = get_sample_offset(demux_res, new_sample);
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/* We know the new file position, so let's try to seek to it */
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if (stream->ci->seek_buffer(new_pos))
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if (stream->ci->seek_buffer(new_pos))
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{
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*sound_samples_done = new_sound_sample;
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*current_sample = new_sample;
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@ -352,74 +339,69 @@ unsigned int alac_seek_raw(demux_res_t* demux_res, stream_t* stream,
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uint32_t file_loc, uint32_t* sound_samples_done,
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int* current_sample)
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{
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uint32_t chunk_sample = 0;
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uint32_t total_samples = 0;
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uint32_t new_sound_sample = 0;
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uint32_t chunk_sample = 0; /* Holds the chunk/frame index. */
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uint32_t total_samples = 0; /* Sums up total amount of chunks/frames. */
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uint32_t new_sound_sample = 0; /* Sums up total amount of samples. */
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uint32_t new_pos;
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uint32_t chunk;
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uint32_t i;
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uint32_t i, tmp_dur, tmp_cnt;
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if (!demux_res->num_chunk_offsets ||
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!demux_res->num_sample_to_chunks)
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/* There is no metadata available to perform raw seek. */
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if (!demux_res->num_chunk_offsets || !demux_res->num_sample_to_chunks)
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{
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return 0;
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}
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/* Locate the chunk containing file_loc. */
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for (i = 0; i < demux_res->num_chunk_offsets &&
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file_loc > demux_res->chunk_offset[i]; i++)
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chunk = 0;
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while (chunk < demux_res->num_chunk_offsets)
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{
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}
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chunk = i + 1;
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new_pos = demux_res->chunk_offset[chunk - 1];
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/* Get the first sample of the chunk. */
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for (i = 1; i < demux_res->num_sample_to_chunks &&
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chunk > demux_res->sample_to_chunk[i - 1].first_chunk; i++)
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{
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chunk_sample += demux_res->sample_to_chunk[i - 1].num_samples *
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(demux_res->sample_to_chunk[i].first_chunk -
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demux_res->sample_to_chunk[i - 1].first_chunk);
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}
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chunk_sample += (chunk - demux_res->sample_to_chunk[i - 1].first_chunk) *
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demux_res->sample_to_chunk[i - 1].num_samples;
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/* Get the position within the chunk. */
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for (; chunk_sample < demux_res->num_sample_byte_sizes; chunk_sample++)
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{
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if (file_loc < new_pos + demux_res->sample_byte_size[chunk_sample])
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if (file_loc < demux_res->chunk_offset[chunk++])
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{
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break;
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}
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new_pos += demux_res->sample_byte_size[chunk_sample];
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}
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new_pos = demux_res->chunk_offset[chunk-1];
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/* Get the first sample of the chunk. */
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i = 1;
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sample_to_chunk_t *tab1 = demux_res->sample_to_chunk;
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while (i < demux_res->num_sample_to_chunks)
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{
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if (chunk <= tab1[i].first_chunk)
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{
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break;
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}
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chunk_sample += tab1[i-1].num_samples * (tab1[i].first_chunk - tab1[i-1].first_chunk);
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++i;
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}
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chunk_sample += (chunk - tab1[i-1].first_chunk) * tab1[i-1].num_samples;
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/* Get the position within the chunk. */
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while (chunk_sample < demux_res->num_sample_byte_sizes &&
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file_loc >= new_pos + demux_res->sample_byte_size[chunk_sample])
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{
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new_pos += demux_res->sample_byte_size[chunk_sample++];
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}
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/* Get sound sample offset. */
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for (i = 0; i < demux_res->num_time_to_samples; i++)
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i = 0;
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time_to_sample_t *tab2 = demux_res->time_to_sample;
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while (i < demux_res->num_time_to_samples)
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{
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if (chunk_sample <
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total_samples + demux_res->time_to_sample[i].sample_count)
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tmp_dur = tab2[i].sample_duration;
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tmp_cnt = tab2[i].sample_count;
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total_samples += tmp_cnt;
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new_sound_sample += tmp_cnt * tmp_dur;
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if (chunk_sample <= total_samples)
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{
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new_sound_sample += (chunk_sample - total_samples) * tmp_dur;
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break;
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}
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total_samples += demux_res->time_to_sample[i].sample_count;
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new_sound_sample += demux_res->time_to_sample[i].sample_count
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* demux_res->time_to_sample[i].sample_duration;
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++i;
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}
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new_sound_sample += (chunk_sample - total_samples)
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* demux_res->time_to_sample[i].sample_duration;
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/* Go to the new file position. */
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if (stream->ci->seek_buffer(new_pos))
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{
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*sound_samples_done = new_sound_sample;
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@ -45,6 +45,18 @@ typedef struct {
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typedef uint32_t fourcc_t;
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typedef struct
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{
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uint32_t first_chunk;
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uint32_t num_samples;
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} sample_to_chunk_t;
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typedef struct
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{
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uint32_t sample_count;
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uint32_t sample_duration;
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} time_to_sample_t;
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typedef struct
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{
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uint16_t num_channels;
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@ -53,19 +65,13 @@ typedef struct
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fourcc_t format;
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void *buf;
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struct {
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uint32_t first_chunk;
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uint32_t num_samples;
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} *sample_to_chunk;
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sample_to_chunk_t *sample_to_chunk;
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uint32_t num_sample_to_chunks;
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uint32_t *chunk_offset;
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uint32_t num_chunk_offsets;
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struct {
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uint32_t sample_count;
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uint32_t sample_duration;
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} *time_to_sample;
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time_to_sample_t *time_to_sample;
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uint32_t num_time_to_samples;
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uint16_t *sample_byte_size;
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